package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除图书的名字：");
        String name = scanner.nextLine();

        int i = 0;
        int delIndex = -1;
        int currentSize = bookList.getUsedSize();
        for( ;i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                System.out.println("找到了这本书，开始删除");
                delIndex = i;
                return;
            }
        }
        if(i == currentSize) {
        System.out.println("无此书");
        return;
        }

        for (int j = delIndex; j < currentSize - 1; j++) {
            Book book = bookList.getBook(j+1);
            bookList.setBooks(j,book);
        }

        bookList.setBooks(currentSize-1,null);
        bookList.setUsedSize(currentSize-1);
        System.out.println("删除图书成功！");
    }
}
